Packaging bag

ABSTRACT

A packaging bag includes a first face including a first edge disposed on a first side of an opening; a second face facing the first face and including a second edge disposed on a second side of the opening; and a cushion in an expandable sheet form and being suspended between the first edge and the second edge, and in which a plurality of slits extending in a direction intersecting a suspension direction are provided in a staggered manner, wherein a percentage of a basis weight of a sheet material forming the cushion with respect to a basis weight of a sheet material forming the first face and the second face is 55 to 80%.

TECHNICAL FIELD

The present case relates to a bag for packaging an article.

BACKGROUND ART

The conventionally used packaging materials include cushion materials such as air cushions provided with multiple air chambers, expandable foam cushions, and single-faced corrugated boards, all of which are in sheet forms deformable in thickness directions. Articles packaged in such cushion materials are sometimes received in packaging bags when transported or stored.

For this reason, packaging bags having the cushion materials have been developed. For example, a proposed packaging bag has a structure in which edges of a pair of sheets provided with multiple air chambers are sealed to each other (see Patent Literature 1).

PRIOR ART DOCUMENTS Patent Literature

Patent Literature 1: Japanese Laid-Open Patent Publication No. 2003-182774

SUMMARY OF INVENTION Problem to be Solved by Invention

However, if the packaging bag is provided with the cushion material deformable in the thickness direction as described above, there is a problem that the packaging bag becomes bulky due to the thickness of the cushion material even before the article is put into the packaging bag, that is, when the packaging bag has not yet been used.

The packaging bag of the present case has been conceived in view of the above-mentioned problems, and one of the objects thereof is to suppress bulkiness in an unused state. The objects of the present case should not be limited to this, and may also be regarded as to yield actions and effects that are derived from each configuration described in the following “DESCRIPTION OF EMBODIMENTS” and that cannot be obtained by the conventional techniques.

Means to Solve Problem

(1) A packaging bag disclosed herein includes: a first face part having a first edge portion disposed on a first side of an opening; and a second face part facing the first face part and having a second edge portion disposed on a second side of the opening. In addition, the packaging bag includes a cushion part in an expandable sheet form and being suspended between the first edge portion and the second edge portion, and in which a plurality of slits extending in a direction intersecting a suspension direction are provided in a staggered manner, wherein a percentage of a basis weight of a sheet material forming the cushion part with respect to a basis weight of a sheet material forming the first face part and the second face part is 55 to 80%.

(2) Preferably, the cushion part is provided so as not to contact with a bottom part when in an expanded state.

(3) Preferably, the cushion part has a paste end portion pasted to an inner face of the first edge portion or the second edge portion.

(4) Preferably, the first face part, the second face part, and the cushion part are made of a same material.

(5) Preferably, the cushion part is suspended in a folio state is between the first edge portion and the second edge portion.

Effects of Invention

According to the packaging bag of the present case, placing an article in the packaging bag causes the cushion part in a sheet form to expand and develop three-dimensional cushion cells associated with the slits, so that a cushioning property can be obtained in the packaging bag by the cushion cells. Moreover, since the cushion part is in a sheet form, the bulkiness of the packaging bag in the unused state can be suppressed as compared with packaging bags using cushion materials such as air cushions and foaming cushions, which are provided with deformation margins for cushioning.

Further, since the percentage of the basis weight of the sheet material forming cushion part with respect to the basis weight of the sheet material forming the first face part and the second face part is 55 to 80%, the packaging bag of the present case is excellent in an impact absorbing property at the time of being dropped or colliding.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view illustrating a packaging bag in an unused state.

FIG. 2 is a longitudinal sectional view of FIG. 1.

FIG. 3 is an enlarged plan view illustrating a main part of a cushion part in an unexpanded state.

FIG. 4 is a longitudinal sectional view illustrating the packaging bag during use.

FIG. 5 is an enlarged perspective view of the main part of the cushion part in an expanded state.

FIG. 6 is a cross-sectional view illustrating a section A-A of FIG. 5.

FIG. 7 is a developed view for explaining configuration of a packaging bag.

FIG. 8 is a perspective view of the packaging bag that can be assembled from the developed view of FIG. 7.

FIG. 9 is a perspective view illustrating another embodiment of the packaging bag.

DESCRIPTION OF EMBODIMENTS

A packaging bag as an embodiment will now be described with reference to the drawings. It should be noted that the following embodiments are merely illustrative, and there is no intention to exclude the application of various modifications and techniques not explicitly described in the following embodiments. Each configuration of the present embodiments can be variously modified and implemented without departing from the gist thereof. Also, it can be selected as necessary, or it can be combined as appropriate.

A packaging bag is a bag for packaging an article(s). The present embodiments describe a packaging bag in which a cushion part for protecting an article to be packaged is provided in a base bag.

The base bag and the cushion part both of which configure the packaging bag, are preferably made of the same material such as paper or resin. However, the base bag and the cushion part may be made of different materials.

The following embodiments describe the packaging bag in a state where an opening is arranged upwards. It should be noted that the acting direction of the gravity is referred to as a downward direction, and the opposite direction of the downward direction is referred to as an upward direction.

[1. Configuration of Packaging Bag]

Firstly, with reference to FIGS. 1 and 2, the base bag 10 of the packaging bag will be described.

The base bag 10 is provided in a gusset-less envelope type with the opening 9 that is opened and closed by a flap 19 formed at the top thereof. Here, a rectangular envelope is exemplified as the base bag 10, but alternatively, an elongated envelope or a western-style envelope may be used as the base bag.

The base bag 10 is provided with a first face part 11 and a second is face part 12 that face each other.

These face parts 11, 12 are connected to each other at: a bottom part 13 provided below the opening 9 in the base bag 10; and two side parts 14, 15 each vertically extending so as to connect the bottom part 13 and the opening 9. Further, an upper edge portion (first edge portion) 110 of the first face part 11 is disposed on a first side (the upper right side in FIG. 1) of the opening 9, and an upper edge portion (second edge portion) 120 of the second face part 12 is disposed on a second side (the lower left side in FIG. 1) of the opening 9.

Furthermore, the flap 19 is provided to protrude upward continuously from the first face part 11.

FIG. 8 illustrates another example of the packaging bag of the present invention. FIG. 7 is a developed view illustrating a method (configuration) for assembling the packaging bag of FIG. 8.

To assemble the packaging bag illustrated in FIG. 8, a base sheet member 10S for configuring the first face part 11 and the second face part 12, and a cushion sheet member 20S to be assembled to the cushion part 20 are prepared.

As illustrated in FIG. 7, in the base sheet member 10S, two lateral creases R_(X1) and R_(X2) (bend lines) each extending in an X direction are provided apart from each other in a Y direction, and two longitudinal creases R_(Y1) and R_(Y2) (bend lines) each extending in the Y direction are provided apart from each other in the X direction. The lateral creases R_(X1) and R_(X2) are arranged in this order toward a Y₂ direction. That is, a second lateral crease R_(X2) is arranged on the Y₂ direction side of a first lateral crease R_(X1). Of the longitudinal creases R_(Y1) and R_(Y2), one being a first longitudinal crease R_(Y1) is arranged on an X₁ direction side of the other one being a second longitudinal crease R_(Y2).

Of the two lateral creases R_(X1) and R_(X2), the first lateral crease R_(X1) is a bend line for sealing the base bag 10, and the second lateral crease R_(X2) is a bend line for assembling the base sheet member 10S into a bag shape.

The base sheet member 10S is bent at the second lateral crease R_(X2) and the two longitudinal creases R_(Y1) and R_(Y2).

The first lateral crease R_(X1), the second lateral crease R_(X2), and the two longitudinal creases R_(Y1) and R_(Y2) form a rectangle outline that defines a first sheet piece 11S corresponding to the first face part 11.

On the Y direction side with respect to the first sheet piece 11S, a flap sheet piece 19S corresponding to the flap 19 is continuously provided on the Y₁ direction side via the first lateral crease R_(X1), and a second sheet piece 12S corresponding to the second face part 12 is continuously provided on the Y₂ direction side via the second lateral crease R_(X2).

Further, on the X₁ direction side and an X₂ direction side with respect to the first sheet piece 11S, paste margin sheet pieces 18S are continuously provided via the longitudinal creases R_(Y1) and R_(Y2), respectively. The paste margin sheet pieces 18S are attached to a surface (corresponding to an outer face of the second face part 12) of the second sheet piece 12S to which the paste margin sheet pieces 18S face when the base sheet member 10S is bent at the second lateral crease R_(X2).

Furthermore, at an edge portion on the Y₁ direction side in the first sheet piece 11S, a first base paste region 110S to which the cushion sheet member 20S is attached is set. Similarly, at an edge portion on the Y₂ direction side in the second sheet piece 12S, a second base paste region 120S to which the cushion sheet member 20S is attached is set. The base paste regions 110S, 120S are regions corresponding to inner faces 111, 121 of the upper edge portions 110, 120 of the above-described face parts 11, 12, respectively. That is, the base paste regions 110S, 120S are provided on the respective surfaces of the first sheet piece 11S and the second sheet piece 12S, which surfaces are to be arranged inside the base bag 10.

<Cushion Sheet Member>

As illustrated in FIG. 7, at respective end portions on the Y₁ direction side and the Y₂ direction side of the cushion sheet member 20S, cushion paste regions 21S, 22S (interior edge regions), which are to be is attached to the base paste regions 110S, 120S (exterior edge regions) are set. The cushion paste regions 21S, 22S respectively correspond to paste end portions 21, 22 of the above-described cushion part 20. It should be noted that slits 23 a are not provided in the cushion paste regions 21S, 22S.

Further, the cushion sheet member 20S is provided with a third lateral crease R_(X3) extending in the X direction (predetermined direction) at a Y directional center thereof. The third lateral crease R_(X3) is a bend line corresponding to a fold line 230.

In a region excluding the cushion paste regions 21S, 22S, the cushion sheet member 20S is provided with a main sheet piece 23S corresponding to a main portion 23. The main sheet piece 23S is provided with the above-mentioned slits 23 a in a staggered manner. Each slit 23 a extends along the X direction.

Next, the cushion part 20 of the packaging bag will now be described.

The cushion part 20 is also referred to as cushion paper, honey paper, or the like, and is a cushion material in a sheet form in which multiple slits 23 a are provided in a staggered manner.

The cushion part 20 is connected and suspended between the upper edge portion 110 of first face part 11 and the upper edge portion 120 of the second face part 12.

The percentage of the basis weight of the sheet material forming the cushion part 20 with respect to the basis weight of the sheet material forming the first face part 11 and/or the second face part 12 is 55 to 80%, and preferably, 60 to 75%. By setting the percentage of the basis weight of the sheet material forming the cushion part 20 with respect to the basis weight of the sheet material forming the first face part 11 and/or the second face part 12 to 80% or less, it is possible to cause the cushion part 20 to expand when an impact is subjected, so that the impact can be absorbed. In addition, by setting the percentage of the basis weight of the sheet material forming the cushion part 20 with respect to the basis weight of the sheet material forming the first face part 11 and/or the second face part 12 to 55% or more, it is possible to absorb the impact acting on the article 1 (packaged object) due to the appropriate control of the expansion of the cushion part 20 when the impact is subjected.

The basis weight of the sheet material forming the first face part 11 and/or the second face part 12 is, more preferably, 60 to 300 g/m², and further preferably, 70 to 250 g/m². By setting the basis weight of the sheet material forming the first face part 11 and/or the second face part 12 to 60 g/m² or more, it is possible to suppress buckling deformation of the first face part 11 and/or the second face part 12 when loads are applied to connection parts of the first face part 11 and/or the second face part 12 and the cushion part 20 by the impact. By setting the basis is weight of the sheet material forming the first face part 11 and/or the second face part 12 to 300 g/m² or less, it is possible to prevent the article 1 (packaged object) from being damaged by providing the packaging bag with appropriate flexibility that lowers the impact acceleration. In terms of packaging workability, the face parts 11, 12 preferably have appropriate stiffness, and specifically, the basis weight of the sheet material forming the first face part 11 and/or the second face part 12 is preferably set to 110 g/m² or more.

The cushion part 20 is roughly classified into two parts: the paste end portions 21, 22 respectively attached to the upper edge portions 110, 120 of the face parts 11, 12; and the main portion 23 provided inside the base bag 10 in a state of being suspended (suspended state) between the paste end portions 21, 22.

Here, the first paste end portion 21 is attached to the inner face 111 of the upper edge portion 110 of the first face part 11, and similarly, the second paste end portion 22 is attached to the inner face 121 of the upper edge portion 120 of the second face part 12. In contrast, the main portion 23 is not attached to any part.

The cushion part 20 is, for example, in a folio state by being folded at the fold line 230 at the center of a suspension direction connecting the first paste end portion 21 and the second paste end portion 22 along the cushion part 20.

The main portion 23 of the cushion part 20 folded in two in this manner is, as illustrated in FIG. 2, roughly classified into two parts: a first main portion 231 on the first paste end portion 21 side; and a second main portion 232 on the second paste end portion 22 side, with the fold line 230 interposed therebetween.

The main portion 23 expands by the weight of the article 1 when receiving the article 1 (see FIG. 4) inserted into the packaging bag through the opening 9.

In other words, before the article 1 is inserted into the packaging bag (in an unused state of the packaging bag), the cushion part 20 is in a state of not being expanded (hereinafter referred to as “unexpanded state”), and after the article 1 is inserted into the packaging bag (during use of the packaging bag), the cushion part 20 is in a state of being expanded (hereinafter referred to as “expanded state”).

The structure that allows the cushion part 20 to expand in this manner is provided in the main portion 23.

Hereinafter, the main portion 23 in the unexpanded state will be described, and thereafter, the main portion 23 in the expanded state will be described.

First, with reference to FIG. 3, the main portion 23 in the unexpanded state will be described.

A large number of slits 23 a are cut and formed in the main portion 23. These slits 23 a are provided at least in the main portion 23 of the cushion part 20.

Each of the slits 23 a extends in a direction (hereinafter referred to as “width direction”) perpendicular to the suspension direction (here, the vertical direction).

The slits 23 a are provided intermittently along the width direction in lines. That is, between the slits 23 a adjacent to each other in the width direction, non-slit parts 23 b which are not cut, are provided.

Assuming that the dimension of the slit 23 a is “L₁” and the dimension of the non-slit part 23 b is “L₂”, Inequality 1 “L₁>L₂” is satisfied.

Here, a first pattern P₁ is defined as an alignment of a single row in which the slits 23 a and the non-slit parts 23 b are alternately arranged along the width direction. Further, a second pattern P₂ is defined as an alignment of another row in which the slits 23 a′ and the non-slit parts 23 b′, which are displaced from the slits 23 a and the non-slit parts 23 b of the first pattern P₁ by a half pitch, are alternately arranged along the width direction. These first patterns P₁ and second patterns P₂ are provided alternately along the suspension direction.

More specifically, the width directional centers C_(a) of the slits 23 a in the first patterns P₁ and the width directional centers C_(b)′ of the non-slit parts 23 b′ in the second patterns P₂ are arranged side by side along is the suspension direction. Similarly, the width directional centers C_(b) of the non-slit parts 23 b in the first patterns P₁ and the width directional centers C_(a)′ of the slits 23 a′ in the second patterns P₂ are arranged side by side along the suspension direction.

The cushion part 20 having the main portion 23 provided with such slits 23 a, 23 a′ and non-slit parts 23 b, 23 b′ is manufactured by using a rotary die-cutter provided with blade portions (cutters) in shapes corresponding to the shapes of the slits 23 a, 23 a′ on its outer periphery, and cutting a slit-less sheet member while rotating the rotary die-cutter. Alternatively, the cushion part 20 is manufactured by using a flat die-cutter provided with blade portions in shapes corresponding to the shapes of the slits 23, 23 a′, and cutting the slit-less sheet material while pressing the sheet material.

A sheet piece on a side (the upper side in FIG. 3) in the suspension direction with respect to the slit 23 a in the first pattern P₁ is roughly classified into a first portion 31, a second portion 32, and a third portion 33, depending on the positions with respect to the slits 23 a′ and the non-slit part 23 b′ in the second pattern P₂.

The first portion 31 is a portion sandwiched between one side (left side in FIG. 3) in the width direction of the slit 23 a in the first pattern P₁ and the other side (right side in FIG. 3) in the width direction of the slit 23 a′ in the second pattern P₂. The second portion 32 is a portion is sandwiched between the respective width directional centers of the slit 23 a in the first pattern P₁ and the non-slit part 23 b′ in the second pattern P₂. The third portion 33 is a portion sandwiched between the other side in the width direction of the slit 23 a in the first pattern P₁ and the one side in the width direction of the slit 23 a′ in the second pattern P₂.

Further, a sheet piece on the other side in the suspension direction with respect to the slit 23 a in the first pattern P₁ is roughly classified into a fourth portion 34, a fifth portion 35, and a sixth portion 36, in the same manner as the above portions 31, 32, and 33.

The fourth portion 34 is sandwiched between the one side in the width direction of the slit 23 a in the first pattern P₁ and the other side in the width direction of the slit 23 a′ in the second pattern P₂. The fifth portion 35 is sandwiched between the respective width directional centers of the slits 23 a in the first pattern P₁ and the non-slit part 23 b′ in the second pattern P₂. The sixth portion 36 is sandwiched between the other side in the width direction of the slit 23 a in the first pattern P₁ and the one side in the width direction of the slit 23 a′ in the second pattern P₂.

Next, with reference to FIGS. 4, 5, and 6, the main portion 23 in the expanded state will now be described.

As illustrated in FIG. 4, the main portion 23 in the expanded state, as compared with the main portion 23 in the unexpanded state, extends in is the suspension direction. In the main portion 23 at this time, the portions 31 to 36 (see FIGS. 5 and 6) rise from the suspension direction to a thickness direction of the face parts 11, 12 (the thickness direction of the main portion 23 in the unexpanded state), and three-dimensional cushion cells 40 are formed by the risen portions 31 to 36. In other words, by the rising of the portions 31 to 36 arranged around one slit 23 a, one cushion cell 40 appears.

Specifically, as illustrated in FIG. 5, a first wall 41 corresponding to the first portion 31, a second wall 42 corresponding to the second portion 32, a third wall 43 corresponding to the third portion 33, a fourth wall 44 corresponding to the fourth portion 34, a fifth wall 45 corresponding to the fifth portion 35, and a sixth wall 46 corresponding to the sixth portion 36 each erect in the cushion cell 40 so as to form the respective side walls of a hexagonal tube.

Incidentally, in a state (hereinafter referred to as “maximum expanded state”) where the main portion 23 is geometrically expanded to the maximum within a range of not being torn, the first wall 41 and the fourth wall 44 extend along the same plane, and the third wall 43 and the sixth wall 46 extend along the other same plane to face the first wall 41 and the fourth wall 44. Thus, in the cushion cell 40 in the maximum expanded state, the walls 41 to 46 erect so as to form the respective side walls of a square tube.

As illustrated in FIG. 4, the cushion part 20 in the expanded state is provided so as not to contact with the bottom part 13 of the base bag 10.

Specifically, the fold line 230 which locates at the lowest position in the cushion part 20 in the maximum expanded state and the bottom part 13 of the base bag 10 are provided so as not to contact with each other. In other words, assuming that: the vertical dimension between upper ends 21 a, 22 a of the paste end portions 21, 22 of the cushion part 20 and the bottom part 13 of the base bag 10 is “M₁”; and the vertical dimension between the upper ends 21 a, 22 a and the fold line 230 of the cushion part 20 in the maximum expanded state is “M₂”, Inequality 2 “M₁>M₂” is satisfied.

It is preferable to set the “M₂” as large as possible to approach the “M₁” while satisfying Inequality 2.

Conversely, as illustrated in FIG. 2, the fold line 230 of the cushion part 20 in the unexpanded state is provided above the bottom part 13 of the base bag 10 by a predetermined dimension “M₃” in advance so that the cushion part 20 in the maximum expanded state does not touch the bottom part 13 of the base bag 10. That is, the cushion part 20 is formed to be short in anticipation of an extension margin.

Next, with reference to FIG. 4, description will now be made in relation to a setting example of the dimensions of the cushion part 20 for is realizing the above-described non-contact structure.

Assuming that the number of rows of the patterns P₁, P₂ in the cushion part 20 is N and a vertical dimension of each paste end portion 21, 22 is M₄, Approximation 3 “M₂-M₄≈(L₁-L₂)×(N/4)” is established.

The left side of Approximation 3 represents the vertical dimension of the first main portion 231 or the second main portion 232 in the maximum expanded state.

On the other hand, (L₁-L₂) of the right side of Approximation 3 represents the dimension in the suspension direction per cushion cell 40 in the maximum expanded state, that is, the dimension in the suspension direction of the first wall 41 and the fourth wall 44.

Further, since the number of the cushion cells 40 aligned in the main portion 23 is half (N/2) the number of rows of the patterns P₁, P₂, the (N/4) on the right side of Approximation 3 represents the number of the cushion cells 40 aligned in the suspension direction in the first main portion 231 or the second main portion 232.

When ignoring the dimensions in the suspension direction of the second wall 42 and the fifth wall 45 extending in the width direction, it can be regarded that the value (the right side of Approximation 3), which is the number (N/4) of the cushion cells 40 aligned in the suspension direction in the first main portion 231 or the second main portion 232 multiplied by the dimension (L₁-L₂) in the suspension direction per cushion cell 40 in the maximum expanded state, approximates the vertical dimension is of the first main portion 231 or the second main portion 232 in the maximum expanded state.

Therefore, by appropriately setting the parameters, such as the width directional dimensions L₁, L₂ of the slits 23 a or the non-slit parts 23 b, the number of rows of the patterns P₁, P₂, and the vertical dimension M₄ of each paste end portion 21, 22, all of which correspond to the terms in Approximation 3, it is possible to design the non-contact structure described above.

In addition, the width directional dimension of the cushion part 20 is set to be slightly smaller than the width directional dimension of each of the face parts 11, 12.

[2. Procedures for Using Packaging Bag]

Next, a method for using the packaging bag will now be described.

As illustrated in FIGS. 1 and 2, the flap 19 is firstly opened to make the opening 9 accessible, unsealing the base bag 10.

Next, the article 1 is put into the packaging bag, and the article 1 is placed on or inserted through the main portion 23 of the cushion part 20. At this time, as illustrated in FIG. 4, the main portion 23 of the cushion part 20 extends in the suspension direction, and thereby, the slits 23 a rise in the thickness direction of the face parts 11, 12, and as illustrated in FIGS. 5 and 6, the cushion cells 40 appear in the main is portion 23.

After that, the flap 19 is attached to the upper edge portion 120 of the second face part 12 of the base bag 10 to seal the packaging bag. At this time, the article 1 is surrounded by the cushion cells 40.

[3. Actions and Effects]

Since the packaging bag of the present embodiment is configured as described above, the following actions and effects can be obtained.

(1) Inserting the article 1 into the packaging bag and placing the article 1 on the main portion 23 of the cushion part 20 cause the main portion 23 in a sheet form in the unexpanded state to expand, and in the main portion 23 turned to the expanded state, the three-dimensional cushion cells 40 associated with the slits 23 a appear. With the cushion cells 40 appeared inside the base bag 10 surround the article 1, the protectability for the article 1 can be ensured, and the cushioning property can be obtained in the packaging bag.

In addition, since the main portion 23 in the unexpanded state is in a sheet form, the bulkiness of the packaging bag in the unused state can be suppressed as compared with the packaging bags using cushion materials provided with deformation margins for cushioning, such as air cushions, foaming cushions, and single-faced corrugated boards.

Further, if a cushion material is provided separately from a base bag in a conventional packaging bag, in order to fix the cushion material is to the base bag, the entire cushion material needs to be pasted to the base bag. In contrast, in the present packaging bag, since the cushion part 20 is suspended, only some portions of the cushion part 20 may be pasted to the base bag 10, which reduces the usage of glue or adhesive.

In addition, since the cushion part 20 exhibits a cushioning function by extending inside the base bag 10, the cushion part 20 is formed to be short in anticipation of the extension margin. This can suppress the amount or weight of the cushion material as compared with packaging bags using, as cushion materials, single-faced corrugated boards manufactured by performing a process (flute process) of corrugating planar material sheets.

(2) Since the cushion part 20 in the unexpanded state is provided so as not contact with the bottom part 13, the contact between the article 1 placed in the packaging bag and the bottom part 13 of the base bag 10 is inhibited, and the protectability for the article 1 can be enhanced.

(3) The paste end portions 21, 22 of the cushion part 20 are respectively attached to the inner faces 111, 121 of the upper edge portions 110, 120 of the base bag 10. This can suppress the amount and/or weight of the material of the cushion part 20 as compared with a packaging bag in which a cushion part is mountain-folded between each paste end portion and a main portion to have the paste end portions pasted to the outer faces of the upper edge portion 110, 120.

In addition, when the paste end portions 21, 22 are pasted to the inner faces 111, 121, the flap 19 of the base bag 10 can be prevented from interfering with the cushion part 20, achieving smooth opening and closing operations of the opening 9.

(4) Since the base bag 10 which is configured by: the first face part 11; the second face part 12; and the flap 19, and the cushion part 20 are made of the same material, the processability of the packaging bag after use can be enhanced. For example, when the packaging bag is reused (recycled) or discarded, there is no need to separate the packaging bag into each material, so that the processing workability can be enhanced. If the base bag 10 and the cushion part 20 are made of paper, the packaging bag after use can be discharged directly to the recycling of used paper or as combustible garbage.

(5) Since the cushion part 20 is suspended in the folio state, the thickness of the packaging bag in the unused state can be reduced as compared to, for example, a packaging bag in which a cushion part is suspended in a state of being folded into three or more.

Specifically, at portion where the main portion 23 is provided in the packaging bag in the unused state, four sheet pieces are laminated in the order of the first face part 11, the first main portion 231, the second main portion 232, and the second face part 12. In contrast, in a cushion part folded in three or more, three or more main portions will be folded is and five or more sheet pieces will be laminated. Therefore, since the thickness of the folded main portion 23 is suppressed, the bulkiness of the packaging bag can be suppressed.

[4. Miscellaneous]

Finally, other modifications of the present embodiment will be described.

For example, the slits and the non-slit parts should not be limited to the orientation extending in the width direction, and only have to extend at least in a direction intersecting the suspension direction. Such an orientation allows the cushion part to extend in the suspension direction.

In addition, the base bag should not be limited to the gusset-less envelope type provided with the flap 19, and may alternatively be various types of bag such as a square bottom bag, a gusset bag, or a stand up pouch, and may include gussets and/or omit the flap.

If a flap-less bag is used as the base bag, the cushion part may be mountain-folded between each of the paste end portions and the main portion to have the paste end portions pasted to the outer face of the upper edge portions 110, 120. In this case, by suspending the cushion part so as to be hung from the face parts 11, 12, it is possible to reliably attach the cushion part to the base bag, enhancing the load bearing property of the cushion part.

In the modification illustrated in FIG. 9, the first paste end portion 21 of the cushion part 20 includes a portion that overlaps the flap 19 of the base bag 10. In this modification, the first paste end portion 21 is bent together with the flap 19 to cover the second face part from the outside in sealing, so that the strength for suspending the packaged object can be enhanced.

EXAMPLES

Hereinafter, the characteristics of the present invention will be further specifically described with reference to Examples and Comparative Examples, however, the scope of the present invention should not be construed as being limited by the specific examples illustrated below.

<Preparation of Packaging Bag Samples>

A packaging bag sample illustrated in FIG. 8 was prepared. The vertical dimension of the first face part (second face part) was 300 mm, and the width directional dimension thereof was 240 mm. The vertical dimension of the cushion part in a folio and in the unexpanded state was 120 mm, and the width directional dimension thereof was 240 mm. The cushion part was pasted to the upper edge portions of the face parts with double-sided tapes.

As for the material of the first face part and the second face part, and the material of the cushion part, those described in Table 1 were used to prepare each packaging bag sample of the Examples and Comparative Examples.

<Evaluation of Samples>

After inserting an impact accelerometer (product name: G-menDR100, manufactured by SRIC Corporation) into each packaging bag sample of Examples and Comparative Examples and sealing them, free fall tests described in the impact test of JISZ0200 were carried out, and the maximum values of the impact accelerations were measured.

Table 1 shows the test results.

TABLE 1 Comparative Comparative Example 1 Example 2 Example 3 Example 4 Example 1 Example 2 Material (A) of Kraft Kraft Kraft Kraft Kraft Kraft first and second paper paper paper paper paper paper face parts 120 g/m² 148 g/m² 120 g/m² 148 g/m² 120 g/m² 148 g/m² Material (B) of Kraft Kraft Kraft Kraft Kraft Kraft cushion part paper paper paper paper paper paper 70 g/m² 90 g/m² 90 g/m² 118 g/m² 50 g/m² 128 g/m² (Basis weight of 58% 61% 75% 80% 42% 86% B)/(Basis weight of A) Maximum value of 81 g/s² 78 g/s² 79 g/s² 80 g/s² 91 g/s² 92 g/s² impact acceleration

As shown by the test results in Table 1 above, as compared with Comparative Examples 1 and 2, Examples 1 to 4 had smaller impact accelerations and were superior in impact absorbing velocities.

DESCRIPTION OF REFERENCE SIGNS

-   1 article -   9 opening -   10 base bag -   11 first face part -   110 upper edge portion (first edge portion) -   111 inner face -   12 second face part -   120 upper edge portion (second edge portion) -   121 inner face -   13 bottom part -   14,15 side part -   19 flap -   20 cushion part -   20S cushion sheet member -   21 first paste end portion -   21 a upper end -   22 second paste end portion -   22 a upper end -   23 main portion -   230 fold line -   231 first main portion -   232 second main portion -   23 a,23 a′ slit -   23 b,23 b′ non-slit part -   31,32,33,34,35,36 portion -   40 cushion cell -   41,42,43,44,45,46 wall -   C_(a),C_(a)′ width directional center of slit 23 a,23 a′ -   C_(b),C_(b)′ width directional center of non-slit part 23 b,23 b′ -   L₁ width directional dimension of slit 23 a,23 a′ -   L₂ width directional dimension of non-slit part 23 b,23 b′ -   M₁ vertical dimension between upper end 21 a,22 a and bottom part 13     of base bag 20 -   M₂ vertical dimension between upper end 21 a,22 a and fold line 230     in maximum expanded state -   M₃ vertical dimension from bottom part 13 to fold line 230 in     unexpanded state -   M₄ vertical dimension of paste end portion 21,22 -   N number of rows of pattern P₁,P₂ -   P₁ first pattern -   P₂ second pattern 

1. A packaging bag comprising: a first face comprising a first edge disposed on a first side of an opening; a second face facing the first face and comprising a second edge disposed on a second side of the opening; and a cushion in an expandable sheet form and being suspended between the first edge and the second edge, and in which a plurality of slits extending in a direction intersecting a suspension direction are provided in a staggered manner, wherein a percentage of a basis weight of a sheet material forming the cushion with respect to a basis weight of a sheet material forming the first face and the second face is 55 to 80%.
 2. The packaging bag according to claim 1, wherein the cushion is provided so as not to contact with a bottom when in an expanded state.
 3. The packaging bag according to claim 1, wherein the cushion comprises a paste end pasted to an inner face of the first edge or the second edge.
 4. The packaging bag according to claim 1, wherein the first face, the second face, and the cushion are made of a same material.
 5. The packaging bag according to claim 1, wherein the cushion is suspended in a folio state between the first edge and the second edge.
 6. The packaging bag according to claim 2, wherein the cushion comprises a paste end pasted to an inner face of the first edge or the second edge.
 7. The packaging bag according to claim 2, wherein the first face, the second face, and the cushion are made of a same material.
 8. The packaging bag according to claim 3, wherein the first face, the second face, and the cushion are made of a same material.
 9. The packaging bag according to claim 6, wherein the first face, the second face, and the cushion are made of a same material.
 10. The packaging bag according to claim 2, wherein the cushion is suspended in a folio state between the first edge and the second edge.
 11. The packaging bag according to claim 3, wherein the cushion is suspended in a folio state between the first edge and the second edge.
 12. The packaging bag according to claim 4, wherein the cushion is suspended in a folio state between the first edge and the second edge.
 13. A packaging bag comprising: a first face part comprising a first edge portion disposed on a first side of an opening; a second face part facing the first face part and comprising a second edge portion disposed on a second side of the opening; and a cushion part in an expandable sheet form and being suspended between the first edge portion and the second edge portion, and in which a plurality of slits extending in a direction intersecting a suspension direction are provided in a staggered manner, wherein a percentage of a basis weight of a sheet material forming the cushion part with respect to a basis weight of a sheet material forming the first face part and the second face part is 55 to 80%. 